Increase breastmilk

Hi mummies. I have been low supply of milk since my 1st born. Now with my second child i have very low supply and also interval nipples so whenever i pump, its very less. How can i increase my supply ? Im currently mix feeding but more to formula as i have less supply. I didn't managed to bf my child for 2 weeks as i was down with covid and separated from her. Tried to pump but very less milk (less than 30ml both side). #pleasehelp